GM 

To cap out a skill in a game, or raise a skill to it's highest level. Also-- Grandmaster.

Originally from certain MUDs, but widespread use began with Ultima Online.

I just GMd my Fletching, Smithing, and Tailoring. Now I can go outside and possibly learn what this 'female' thing is I keep hearing about.

GM by Fetch April 27, 2004

gm 

In a course of a conversation, one may say things that annoy the other, or say things that are true and the other person doesn't want to face that truth, so they respond with "gm".

Martin: "So, did you finish this English homework?"
Robin: "No."
Martin: "Why not? Too lazy to use your concious mind and get some primitive ideas down on paper?"
Robin: "gm, Martin, gm."

gm by Martin Luptak January 12, 2006

GM 

Good Mannered, a term most people use now a days online when they don't want stupid ass people going into their channels on B.Net going "YOU SUCK DICK..." etc. etc.

Player 1: Hi, are you GM?
Player 2: FUCK NO
Player 1: Oh, then I don't want to game with you sorry...
Player 2: STFU nerd!
Player 1: >kick Player 2 manner please
Player 1 has kicked Player 2 out of the channel.

GM by Frank G. November 20, 2004

GM 

Any of a line of engineering abortions produced for the last hundred years or so. Similar to a medieval torture device, but without the quality. Any automobile belonging to the fecal genus.

My GM is such a steaming pile of feces, I can't bring my self to spend $10 on a car wash.
or
How unusual, there is a GM that still runs.

GM by Jeff March 12, 2004

GM 

Stands for General Motors. Often used in shorthand as an umbrella term for its several brands (Chevrolet Pontiac Oldsmobile Buick Cadillac Holden Hummer Saturn GMC) etc.

Friend 1: I just got a Chevrolet Chevelle!
Friend 2: ugh more GM junk... Whatever floats your boat I guess

GM by Welldavis December 7, 2021

GM 

Good automotive value for the money. Those who think otherwise are too busy spewing liberal bullshit to realize it. Down with the clowns.

Counter-example: Neil

GM by Robert Lutz January 13, 2004

GM 

A Game Master or in Anarchy Online, a Genetic Manipulator which sounds gay.

Basically this being is rude, nasty and avoided at all costs. They think they know how to play the game but they have no idea at all, in fact some, especially in Anarchy Online are only learning how to be rude and totally lame there, before they move to the next Funcom failure, Age of Conan.

player:'Oh god I need to petition as I've lost a backpack'
GM: 'fuck off'

player: 'I'm being harrassed help me please'
GM 16hours later : 'fuck off bullied noob'

Player: ' Can you tell me how to trade as I am really new and I want to know more about Anarchy Online?'
GM: 'fuck off you total noob'

GM by Esther Hardwick October 24, 2006